Calculate how many patio slabs you need for your patio or path. Enter the area and we round up to whole slabs, with 10% allowance for cuts and breakages.
Popular 600×600mm slabs cover 0.36m² each — roughly 3 per square metre. Sub-base, sand and mortar are separate; our sand calculator works out the bedding layer.
01 — The Calculator
Pick a material, pace out your plot, and the value engine prices every way to fill it — hippo bags, dumpy bags or handy sacks.
Enter dimensions to calculate.
Area
0.0 m²
600×600 slabs
0 approx
Wastage
+10%
Patio packs
0 × 15.25m²
Enter your plot dimensions and the value engine will price the cheapest way to cover it.
Worked example: 12m² patio
12m² ÷ 0.36m² = 33.3, plus 10% wastage = 37 slabs of 600×600mm. The calculator checks every slab size in the catalogue and prices the best value option.
Each covers 0.36m², so 2.8 per m² — round up and add 10% for cuts.
Garden Calculator — Project
My garden project · 20 September 2026
| Item | Qty | Each | Total |
|---|---|---|---|
| Estimated total | £0.00 | ||
Prices from the Garden Calculator sample trade catalogue — confirm with your merchant before ordering.